Korea corporate compliance requirements begin the moment registration is complete, not at the end of the first year. The twelve months after incorporation carry more deadlines than the registration process itself, and missing one is easy when the filing calendar is unfamiliar.
Most of the trouble we see in first-year foreign-invested companies is not complexity. It is sequencing. A deadline that would have taken an afternoon becomes a penalty because nobody knew the clock had started. This post sets out what belongs on the calendar, in the order it arrives.
The filings that start immediately
Business registration with the tax office
Corporate registration and business registration are two separate steps, and conflating them is the single most common first-year error. Court registration creates the legal entity. Business registration with the National Tax Service creates the taxpayer.
The application must be filed with the competent district tax office within 20 days of the business start date. It can be filed before operations begin, and for most foreign-invested companies that is the better choice, because the certificate is a prerequisite for opening a corporate bank account and for issuing tax invoices.
Missing the window is not a formality. Late registration carries a penalty of 1 percent of the supply value from the business start date to the day before the application, and the company cannot receive tax invoices for the unregistered period, which means the input VAT on early expenses is generally lost. For a company that spent on fit-out, equipment or professional fees before registering, that can be a meaningful amount.
The application can be submitted at the district tax office or online through Hometax, the National Tax Service portal. The certificate is normally issued within a couple of working days, longer if the tax office wants to verify the premises.
Foreign investment notification follow-up
If the company was established as a foreign-invested company under the Foreign Investment Promotion Act, the notification filed before incorporation is only the first half of the process. Once capital has been remitted and the shares registered, the investment has to be reported and the foreign-invested company registration certificate obtained.
This does not happen automatically on the back of the court registration, and it is the step most often left undone. The certificate matters later: it is what evidences the company’s foreign-invested status when applying for incentives, for certain visas, and when remitting dividends out of Korea. Invest KOREA publishes general guidance on the notification framework.
The four social insurances
From the first employee, enrolment in the four major insurances is mandatory: national pension, national health insurance, employment insurance and industrial accident compensation insurance. Each has its own reporting deadline running from the hire date, and they are not identical, so confirm the specific dates for your situation rather than assuming a single deadline covers all four. Registration is handled through the combined social insurance portal.
A point worth flagging: a foreign director drawing a salary is an employee for this purpose. A company whose only person on payroll is its own representative director still has the obligation.
Monthly and quarterly Korea corporate compliance requirements
VAT returns
Corporations file VAT four times a year, not annually. The year splits into two taxable periods, each with a preliminary return and a final return.
| Period covered | Return | Due |
|---|---|---|
| January to March | Preliminary | 25 April |
| April to June | Final, first period | 25 July |
| July to September | Preliminary | 25 October |
| October to December | Final, second period | 25 January |
The first return after registration is where companies get caught, usually because someone assumed an annual filing schedule carried over from the parent company’s home jurisdiction. A zero-revenue company still files.
Withholding tax
Withholding tax on employment income is reported and paid monthly, by the tenth day of the month following payment. This applies from the first payroll run, including the case where the only person on payroll is a single foreign director.
A semi-annual option exists, but it is narrower than it is often described. It is not simply available to small employers. It requires all of the following:
- An average of 20 or fewer regular employees in the preceding tax year, measured month-end by month-end. For a newly established company, headcount is assessed on the half-year in which the application falls.
- The business is not in finance or insurance, which are excluded.
- Approval from the head of the competent district tax office. Meeting the headcount threshold does not by itself change anything; without approval the monthly obligation continues.
- Application within the single month immediately before the half-year you want it to apply from. December for the first half, June for the second. Miss the window and you wait six months.
Where approval is granted, the first half is reported and paid by 10 July and the second half by 10 January of the following year. Certain income types remain outside the semi-annual treatment, so it does not eliminate monthly work entirely.
One practical consideration before applying: under semi-annual payment, there is no monthly payment record. If you expect to need withholding payment evidence for an investor, a grant application or a licence, the monthly schedule produces documentation that the semi-annual schedule does not.
Year-end, where most of the work sits
Year-end tax settlement
Year-end tax settlement (연말정산) reconciles what was withheld from each employee across the year against what was actually owed, with the difference refunded or collected. The employer runs it, normally with the February payroll, for the preceding calendar year.
This is an employer obligation, not something employees handle for themselves, and it is the filing first-year companies are least prepared for. The deduction categories are detailed, the rules move annually, and there is usually nobody in a new entity who has run one before. It is the most commonly outsourced item on this list, and reasonably so.
Corporate income tax return
The corporate income tax return is due within three months of the fiscal year end. For a December year end, that is 31 March. Local income tax is a separate return, assessed at 10 percent of the corporate tax liability, and falls one month later at the end of April.
There is also an interim corporate tax payment in the second year and beyond, due at the end of August for a December year end. It is calculated either on half the prior year’s assessed tax or on actual first-half results. A company that grew substantially through the year and defaulted to the simpler method carries the shortfall into the final settlement rather than receiving a refund, so it is worth modelling rather than defaulting.
Financial statements and approval
Financial statements have to be prepared, approved by shareholders at the annual general meeting, and filed. For a December year end the approval sits in the same compressed window as the tax return. Whether an external audit is required depends on the company’s size and type under the external audit legislation, and the thresholds are worth checking in year one rather than discovering the obligation in year two.
The three that catch people out
Capital registration timing. Capital has to be remitted, verified and reported in a particular sequence. Done out of order, the paperwork gets redone, and in the worst case the foreign-invested status is delayed while the company is already trading.
Director residency and visa status. Registering a company does not confer the right to work in it. A foreign director who will be physically working in Korea needs the appropriate visa in his or her own right, and the visa application often depends on documents produced during registration. Sequencing the two together is far easier than retrofitting.
Dormant company obligations. A company with no activity still files. Zero revenue does not mean zero filings: the VAT returns, the corporate tax return and the financial statements are all still due. A dormant entity that quietly stops filing accumulates penalties, and the cost of regularising it later routinely exceeds what the filings would have cost.
Planning around the calendar
If you are registering now, the first deadline lands within weeks. The heaviest stretch is the following January through March, when the Q4 VAT final return, year-end settlement, and the corporate tax return and financial statement approval arrive in close succession, with local income tax immediately behind them.
The practical lesson from first-year companies is unglamorous. The ones that appoint an accounting and payroll provider at registration rather than after the first missed deadline avoid almost all of the scramble, because the calendar is built before the clock starts rather than reconstructed under pressure. Our Korea market entry insights cover the surrounding operational questions in more detail.
For the registration process that precedes all of this, see our Korea company registration guide.
Work with Pearson & Partners Korea Today
We support foreign companies across the full lifecycle of a Korean operation: company incorporation, Employer of Record and payroll, tax and accounting, visa advisory, and market entry strategy.
- Contact: pearsonkorea.com/contactus
- Phone: +82 02 6952 7579
- Office: 30th Floor, WTC Trade Tower, 511 Yeongdong-daero, Gangnam-gu, Seoul 06164, Republic of Korea
Frequently asked questions
Do we need to file if the company has no revenue yet?
Yes. A company with no activity still has filing obligations, including VAT returns, the corporate income tax return and financial statements. Zero revenue does not mean zero filings, and a dormant company that stops filing accumulates penalties.
When is business registration with the tax office due?
Within 20 days of the business start date, at the competent district tax office or online through Hometax. It can also be filed before operations begin. Late registration carries a penalty of 1 percent of supply value for the unregistered period and generally forfeits input VAT credit on that period’s expenses.
Can we pay withholding tax twice a year instead of monthly?
Only with approval. The company must have averaged 20 or fewer regular employees in the preceding tax year, must not be in finance or insurance, and must apply to the district tax office during the single month before the half-year concerned, meaning December or June. Without approval the monthly schedule continues.
Can we handle year-end settlement ourselves?
It is possible, but it is the filing most first-year companies outsource. The employer runs it with the February payroll for the preceding year, the deduction categories are detailed, and the rules change annually.
When does the first corporate tax return fall due?
Within three months of the fiscal year end. For a company closing in December, the deadline is 31 March. The separate local income tax return follows one month later, at the end of April.
This article reflects Korean tax and corporate rules as in force at the date of publication. Filing deadlines and thresholds change, and the obligations that apply to a particular company depend on its size, fiscal year and business type. This is general information, not legal, tax or accounting advice. Confirm your position with a licensed Korean tax accountant or attorney before relying on it.
#ForeignInvestedCompany #KoreaCompliance #KoreaTax #KoreaPayroll #YearEndClosing #DoingBusinessInKorea
